Poison:
if you see carefully it has two holes (keys) on the corner where the shells are attached to each other. On the back side there are remainings of of lines which comes out from one pioint. They are found on the seashore that means are growing in salty water.
the length is five cm and width 3 cm.

This tooth is found in the archeological ruins in my town. There is na amphitheater here where the gladiators fought against each other but ostly they fought with animals. This amphitheater is built in 2nd century BC.
So can any one identyfy to what animal this tooth belong. Some said it is a wild boer sime to a carvorius or Feline animals.
I am asking some one who is expert.